CN204671126U - A kind of signal processing system based on electromagnetic wave life-detection instrument - Google Patents
A kind of signal processing system based on electromagnetic wave life-detection instrument Download PDFInfo
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- CN204671126U CN204671126U CN201520099919.0U CN201520099919U CN204671126U CN 204671126 U CN204671126 U CN 204671126U CN 201520099919 U CN201520099919 U CN 201520099919U CN 204671126 U CN204671126 U CN 204671126U
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Abstract
The utility model discloses a kind of signal processing system based on electromagnetic wave life-detection instrument, comprise the signal transmitting and receiving module, signal acquisition module, data processing module and the display module that connect successively; Described data processing module comprises micro controller module and connected ADC front end circuit, keyboard circuit, reset circuit, clock circuit and power circuit; This utility model can effectively reduce the complexity of circuit, reduces the cost of whole system, improves the actual use value of whole system.
Description
Technical field
This utility model relates to a kind of signal processing system, particularly relates to a kind of signal processing system based on electromagnetic wave life-detection instrument, belongs to signal processing control field.
Background technology
In recent years, no matter be that China or other countries all there occurs some great natural disasters.During in January, 2008 in February, 2013, the whole world there occurs 114 more than 7 grades earthquakes, 6 more than 8 grades earthquakes altogether, wherein just has 8.0 grades of earthquakes that on May 12nd, 2008 occurs in China Wenchuan County in Sichuan Province.Wenchuan earthquake involves Sichuan, Gansu, Shaanxi, Chongqing, Yunnan, Shanxi, Guizhou, Hubei 8 provinces and cities, causes huge casualties and property loss.
Except Wenchuan earthquake, China also there occurs a series of major disaster and the accidents such as Zhouqu County's mud-stone flow disaster.China is the vast country in a territory, the area of 9600000 square kilometres occupies third place in the world, but says from another meaning, and the probability that disaster occurs in China is also relatively large, and in the rescue of disaster, electromagnetic wave life-detection instrument can give play to great effect.In addition, electromagnetic wave life-detection instrument can also be used for military affairs, anti-terrorism, and the fields such as safety check have broad application prospects.
In the last few years along with the development of the subjects such as radar, computer, biomedical engineering, and military, social development needs, create this new technique of electromagnetic wave life detection.The penetrance that it utilizes electromagnetic wave good and electromagnetic Doppler effect, when not needing direct contact target life entity, utilizing the human life parameters such as breathing, heart beating, seeking life entity.Through the further investigation to electromagnetic wave life-detection system, find that existing electromagnetic wave life-detection system also exists some problems.Wherein, main problem is that electromagnetic wave life-detection instrument has higher technical costs and higher hardware cost, and result in electromagnetic wave life-detection instrument can not large-scale promotion.
Electromagnetic wave life-detection instrument is carry out fast Fourier transform (FFT) to the received signal to the core in life signal testing process.Fast Fourier transform (FFT) is the one algorithm fast and effectively in order to reduce discrete Fourier transform (DFT) operand, and their object is all convert the signal into frequency domain and carry out corresponding spectrum analysis.Although the operand of FFT significantly reduces, when calculating the FFT of N point, still need Nlog2N sub-addition and 0.5Nlog2N multiplication [1].When N is larger, the demand of complex operation to the computing capability of device therefor and RAM complicated in FFT process is also very large.Current the developed life-detection instrument overwhelming majority is all adopt special DSP or adopt FPGA to carry out this process.Use these elements can bring higher cost, cause holding at high price of electromagnetic wave life-detection instrument, be unfavorable for the large-scale promotion of product.And only a few adopts the scheme of single-chip microcomputer all to have employed multiple single-chip microcomputer to calculate in order to the process that can complete FFT, both the complexity of equipment had been added, the reliability of equipment has been lowered to a certain extent, again can not the problem of effective workout cost.If a kind of monolithic single-chip microcomputer that can only rely on can be developed just can effectively reduce cost to the life-detection instrument completing whole processing procedure, the popularization of expedite product.
At present, the process adopting FFT computing to carry out life signal more.But because existing design adopts the equipment that calculated performance is stronger mostly, thus substantially all original fft algorithm is being used in the designs, do not do further optimization when writing working procedure, result in these systems and consume a large amount of system resource on the calculating process of FFT, reduce the work efficiency of whole system.
Utility model content
Technical problem to be solved in the utility model provides a kind of signal processing system based on electromagnetic wave life-detection instrument for the deficiency of background technology, it can effectively reduce the complexity of circuit, reduce the cost of whole system, improve the actual use value of whole system.
This utility model is for solving the problems of the technologies described above by the following technical solutions:
Based on a signal processing system for electromagnetic wave life-detection instrument, comprise the signal transmitting and receiving module, signal acquisition module, data processing module and the display module that connect successively; Described data processing module comprises micro controller module and connected ADC front end circuit, keyboard circuit, reset circuit, clock circuit and power circuit; Described signal transmitting and receiving module is used for emitting electromagnetic wave and carries out life detection, described signal acquisition module is used for carrying out A/D conversion to the received signal and being recorded and transmit, the signal that described data processing module is used for signal acquisition module transmission comes is carried out date processing and then is shown in real time by display module, and described power circuit is used for providing electric energy needed for micro controller module, ADC front end circuit, keyboard circuit, reset circuit, clock circuit.
As the further preferred version of a kind of signal processing system based on electromagnetic wave life-detection instrument of this utility model, described signal transmitting and receiving module is provided with a transmit antennas and two reception antennas, the interference that some factors for eliminating in environment cause signal.
As the further preferred version of a kind of signal processing system based on electromagnetic wave life-detection instrument of this utility model, described micro controller module adopts C8051F120 single-chip microcomputer.
As the further preferred version of a kind of signal processing system based on electromagnetic wave life-detection instrument of this utility model, described display module is LCD display.
As the further preferred version of a kind of signal processing system based on electromagnetic wave life-detection instrument of this utility model, described power module adopts chargeable storage.
This utility model adopts above technical scheme compared with prior art, has following technique effect:
1, this utility model can effectively reduce the complexity of circuit, reduces the cost of whole system, improves the actual use value of whole system;
2, this utility model employs one piece of single-chip microcomputer to complete whole control and operation, and the production cost of system is reduced greatly, is convenient to promote, and the electromagnetic wave life-detection instrument therefore designed herein has higher practical value.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is the structure principle chart of this utility model data processing module;
Fig. 3 is power circuit principle figure of the present utility model;
Fig. 4 is clock circuit schematic diagram of the present utility model;
Fig. 5 is reset circuit schematic diagram of the present utility model;
Fig. 6 is ADC front end circuit schematic diagram of the present utility model;
Fig. 7 is keyboard circuit schematic diagram of the present utility model;
Fig. 8 is display circuit schematic diagram of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
As shown in Figure 1, a kind of signal processing system based on electromagnetic wave life-detection instrument, comprises the signal transmitting and receiving module, signal acquisition module, data processing module and the display module that connect successively, part outside dotted line frame is the front end radar system part of electromagnetic wave life-detection instrument, it is then back end signal processing system part in frame, front end radar system be a small-sized hand-held radar installations, the electromagnetic wave of characteristic frequency can be launched to carry out life detection, its transceiver module has a transmit antennas and two reception antennas, this is a kind of design conventional in electromagnetic wave life-detection instrument, in order that the signal that them can be utilized to collect respectively carries out the interference that computing causes to some factors eliminated in environment signal, back end signal processing system part is by acquisition module, data processing module and display module composition, whole rear module receiving front-end radar signal is gone forward side by side row relax.Specifically, acquisition module is exactly carry out A/D conversion to the received signal and recorded, transmit the module that is further processed; Data processing module is the core of whole system, and it is responsible for the work allocating whole system, processes simultaneously, and output to display module to A/D data; Display module is the module showing the result of electromagnetic wave life detection with figure or word intuitively, and the computing in figure mono-and control module are data processing module.
As shown in Figure 2, described data processing module comprises micro controller module and connected ADC front end circuit, keyboard circuit, reset circuit, clock circuit and power circuit; Described signal transmitting and receiving module is used for emitting electromagnetic wave and carries out life detection, described signal acquisition module is used for carrying out A/D conversion to the received signal and being recorded and transmit, the signal that described data processing module is used for signal acquisition module transmission comes is carried out date processing and then is shown in real time by display module, and described power circuit is used for providing electric energy needed for micro controller module, ADC front end circuit, keyboard circuit, reset circuit, clock circuit.
Wherein, described signal transmitting and receiving module is provided with a transmit antennas and two reception antennas, for the interference that some factors eliminated in environment cause signal, described micro controller module adopts C8051F120 single-chip microcomputer, described display module is LCD display, and described power module adopts chargeable storage.
This utility model designs for core with C8051F120 single-chip microcomputer, realizes the FFT computing to input signal and display, and detects whether have life signal to exist.The design comprises hardware circuit design and software design two parts, wherein the most important thing is that the FFT program to operating on C8051F120 single-chip microcomputer carries out specific aim optimization, and then only uses one piece of single-chip microcomputer to complete whole functions.Design herein can effectively reduce the complexity of circuit, reduces the cost of whole system, improves the actual use value of whole system.
The requirement of data processing module to chip type is higher than the requirement of control section to chip type, because the FFT computing that arithmetic section carries out has very large operand.Specifically, the FFT utilizing the base 2-FFT algorithm of temporal decimation to calculate N point before not carrying out program optimization needs Nlog2N sub-addition and 0.5Nlog2N multiplication.In addition, owing to needing the butterfly computation carrying out many wheels in FFT calculating process, in order to these results of real-time calling, need to consume larger RAM and preserve data in computing.In order to process input signal timely, this utility model needs a chip with stronger computing capability, thus roughly has following 4 kinds of selections:
(1) select the DSP optimized for computing with a piece as this module
(2) select with one piece of FPGA with stronger operational capability as this module
(3) select with one piece of single-chip microcomputer through optimal design as this module
(4) select the combination based on above three kinds of schemes, select polylith chip as this module
The selection of acquisition module: the C8051F120 single-chip microcomputer that the design selects with the ADC of 12 100ksps, the ADC of 8 500ksps, the DAC [8] of two 12.The ADC that C8051F120 carries enough meets precision and the sample rate of the system of the design, can also accomplish to reduce circuit scale simultaneously, saves the effect of hardware cost, and the ADC that thus acquisition module here adopts single-chip microcomputer to carry has come.
Fig. 8 is display circuit schematic diagram of the present utility model.Display module will demonstrate waveform, because only can selected element formation LCD.Lattice type LCD not only can show letter, numbers and symbols, can also show various figure, curve and Chinese character, and can realize screen and roll up and down, and reversion, the functions such as flicker, purposes is very extensive.Dot matrix type LCD has all size optional, the 128(row selecting here to commonly use) × 64(is capable) LCD display module.In the signal processing system of whole electromagnetic wave life-detection instrument, by the input/output interface of single-chip microcomputer, the program utilizing C language to write to the data transmission of control LCD and control, thus demonstrates the waveform that system acceptance arrives
Fig. 3 is power circuit principle figure of the present utility model; 220V alternating current is converted to 5V unidirectional current by an external power supply adaptor, and is input in power circuit by the supply socket JP1 in figure and is further processed.First the 5V unidirectional current of input carries out voltage stabilizing through 1N5819 Schottky diode, then carries out voltage-regulation work by one piece of conventional voltage stabilizing chip AMS1117-3.3V, 5V input voltage is adjusted to 3.3V.AMS1117 is the linear voltage regulator of a low voltage difference, provides perfect overcurrent protection and overheat protective function, has good stability.AMS1117 function admirable, can guarantee that output voltage and reference source precision are in the accuracy rating of ± 1%.Only ensure that an accurate and stable voltage, just can guarantee that single-chip microcomputer can work normally.In addition, the collection of AD data needs a reference value accurately, and the reference voltage of the ADC that C8051F120 single-chip microcomputer carries is 2.5V, and it self VERF pin provides the reference voltage of 1.2V, therefore needs to provide voltage from outside.Have 3 pins to need to be connected with reference voltage, be respectively VERFD, VERF0 and VERF1.In order to obtain the reference voltage of 2.5V accurately, in the design, employ one piece of TL431 chip.TL431 is a kind of three end adjustable shunt reference sources having good thermal stability.Its output voltage just can be set to from reference voltage (2.5V) to any value within the scope of 36V arbitrarily with two resistance.
Fig. 4 is clock circuit schematic diagram of the present utility model; The clock signal of C8051F120 single-chip microcomputer is produced by internal programmable crystal oscillator, and have the clock generator of an independent operating in C8051F120 inside, this clock generator can be defaulted as system clock after the reset.If needed, clock source operationally can be switched to the system clock that external oscillator produces.C8051F120 single-chip microcomputer can use crystal, ceramic resonator, electric capacity, RC etc. as external oscillator [9].In addition, the PLL(phaselocked loop provided in sheet) allow to reach higher system clock frequency to improve the speed of service.In the design, use C8051F120 single-chip microcomputer is carried out whole computings and controlling functions, in order to can arithmetic speed be improved, need the clock frequency making single-chip microcomputer reach the highest as much as possible.
In clock circuit, select a 25MHz quartz crystal oscillator external, and opened under frequency multiplication makes C8051F120 single-chip microcomputer be operated in the frequency of 100MHz in a program, thus the peak performance of 100MIPS can have been reached.
Fig. 5 is reset circuit schematic diagram of the present utility model; Adopt electrification reset mode and outside RST pin reset mode.In the system electrification moment, single-chip microcomputer remains on reset mode always, until single-chip microcomputer voltage rise is to exceeding reset level, is called electrification reset mode by reset mode.And when system cloud gray model occurs abnormal, adding a Low level effective signal at RST pin will cause single-chip microcomputer to enter reset mode, and this mode is called outside RST pin reset mode.Preferably when using outside RST pin reset mode can provide an outside pull-up for RST pin or to the decoupling of RST pin, can prevent very noisy from causing monolithic processor resetting like this.
General RC circuit is adopted to carry out external reset.During system electrification, in power circuit, the resistance R2 of the 3.3V output voltage of AMS1117 chip in reset circuit charges to electric capacity C5, produces reset low level, single-chip microcomputer is resetted.When system cloud gray model occurs abnormal, press manual reset button S1 and input voltage is carried out dividing potential drop by resistance R1, R2, produce reset low level, start to reset.Reset complete after, system enters normal duty.
Fig. 6 is ADC front end circuit schematic diagram of the present utility model; The voltage range that the ADC of C8051F120 single-chip microcomputer can change is 0 ~ 2.5V, and the voltage exceeding this scope not only can not correctly be changed, and also can damage the pin of single-chip microcomputer.Therefore, extraneous signal must pass through signal processing circuit before input single-chip microcomputer, changes, become 0 ~ 2.5V voltage signal to voltage, could correct process and display input signal.
Fig. 7 is keyboard circuit schematic diagram of the present utility model; Only used 3 buttons, and C8051F120 single-chip microcomputer has sufficient I/O confession user to use, therefore preliminary decision uses independent keyboard.Through further considering, in order to save mcu resource to carry out signal processing, should simplify the system resource that other subprograms take, this illustrates more fully and should use independent keyboard.Three independently button receive the P2.0-P2.2 mouth of single-chip microcomputer respectively, three buttons are by a common end grounding, and pin corresponding when thus pressing the button can receive a low level signal.
Fig. 8 is display circuit schematic diagram of the present utility model: 12864 liquid crystal adopt parallel mode to connect.When adopting parallel mode, the PSB pin of 12864 is connected into high level, and its 8 data/address bus DB0-DB7 are connected respectively to the P3.0-P3.7 interface of single-chip microcomputer.The V0 interface of 12864 liquid crystal is connected with VCC with GND by the slide rheostat of a 10k, can by the contrast regulating the resistance size of this slide rheostat to adjust LCD screen.
Claims (4)
1. based on a signal processing system for electromagnetic wave life-detection instrument, it is characterized in that: comprise the signal transmitting and receiving module, signal acquisition module, data processing module and the display module that connect successively; Described data processing module comprises micro controller module and connected ADC front end circuit, keyboard circuit, reset circuit, clock circuit and power circuit; Described signal transmitting and receiving module is used for emitting electromagnetic wave and carries out life detection, described signal acquisition module is used for carrying out A/D conversion to the received signal and being recorded and transmit, the signal that described data processing module is used for signal acquisition module transmission comes is carried out date processing and then is shown in real time by display module, and described power circuit is used for providing electric energy needed for micro controller module, ADC front end circuit, keyboard circuit, reset circuit, clock circuit.
2. a kind of signal processing system based on electromagnetic wave life-detection instrument according to claim 1, it is characterized in that: described signal transmitting and receiving module is provided with a transmit antennas and two reception antennas, the interference that some factors for eliminating in environment cause signal.
3. a kind of signal processing system based on electromagnetic wave life-detection instrument according to claim 1, is characterized in that: described micro controller module adopts C8051F120 single-chip microcomputer.
4. a kind of signal processing system based on electromagnetic wave life-detection instrument according to claim 1, is characterized in that: described display module is LCD display.
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| CN201520099919.0U CN204671126U (en) | 2015-02-11 | 2015-02-11 | A kind of signal processing system based on electromagnetic wave life-detection instrument |
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| CN201520099919.0U CN204671126U (en) | 2015-02-11 | 2015-02-11 | A kind of signal processing system based on electromagnetic wave life-detection instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680429A (en) * | 2016-12-26 | 2017-05-17 | 江南大学 | Life detection device and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680429A (en) * | 2016-12-26 | 2017-05-17 | 江南大学 | Life detection device and application thereof |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20170211 |